01 - Set oven or dehydrator to 170 °F (75 °C) and allow to fully preheat.
02 - Combine strawberries, mango, and sweetener in a blender. Process until the mixture is completely smooth.
03 - Line a baking sheet with parchment paper. Pour the fruit puree onto the paper and spread into an even, thin layer approximately 1/8 inch thick using a spatula.
04 - Place baking sheet in oven or dehydrator. Dry for 3 to 4 hours, checking periodically, until surface is dry yet pliable without becoming brittle.
05 - Remove sheet from appliance and allow fruit leather to cool completely.
06 - Carefully peel fruit leather from parchment. Cut into strips using scissors or a sharp knife, and roll up.